The IOBluetooth library is however, a standard Framework like the Foundation Framework.I also have tried building it for a 32-bit machine (build fails again). The common problem should be a reference to a file, of which only the header files are imported and no implementation (*.m-file) is found by the linker. It is my first experience with Xcode 4.6.3.I am trying to write a very simple console program, that searches for paired BT devices and prints them to an NSLog.It builds with the following error: Undefined symbols for architecture x86_64:"_OBJC_CLASS_$_IOBluetoothDevice", referenced from:Ld: symbol(s) not found for architecture x86_64Clang: error: linker command failed with exit code 1 (use -v to see invocation)I searched like crazy. There are some drawbacks (like the entitlement issue I noted earlier) but in most cases it’s a quick and easy path to a solution. Check the box to also include it in your test bundle target.I work on a lot of command line tools and I end up using this technique a lot.You can add it by:Clicking on your project in the upper left of the left pane (the blue icon).In the middle pane, click on the Build Phases tab.Under “Link Binary With Libraries”, click on the plus button.Find the IOBluetooth.framework from the list and hit Add.This will make sure that the IOBluetooth.framework definitions are found by the linker. 1:It looks like you are missing including the IOBluetooth.framework in your project. How to solve this problem? Solution no.If you’re using Cocoapods – you should do the same for “Pods” target.Undefined symbols for architecture x86_64: “_OBJC_CLASS_$_xxx”,This generally means, you are calling “xxx” (it may be a framework or class) from the class “yyy”. Because, some libs (not Apple’s) were compiled for x32 originally and doesn’t support x64.So what you need, is to change the “Architectures” for your project target like thisNB. Do not use x32 libraries in your projectSo the answer below is not correct anymore!The new Xcode 5.1 sets the architecture armv7,armv7s,and arm64 as default.And sometimes the error “build failure “Undefined symbols for architecture x86_64”” may be caused by this.4:I have also seen this error on Xcode 7.2 when the derived data becomes corrupted (in my case I interrupted a build and suspect that was the root cause).So if the other solutions (notably Chris’s and BraveS’s which I suspect are more likely) do not fit your problem try deleting derived data (Select: Window / Projects / Derived Data -> Delete) and re-building.(Added for reference by others – I know the original question has been answered correctly). Don’t forget to check the “ Copy items if needed” box. There, you can see the missing files and just add them to your project.
Symbol(S) Not Found For Architecture X86_64 Valgrind Bluetooth Library IsI accidentally deleted the files in the following directory on it. 7:I also encountered the same problem , the above methods will not work. Some of my newly added implementation ( Class.m ) were missing inXcode->Targets->Build Phases->Compile SourcesThen I could compile & build successfully. Undefined symbols for architecture x86_64:“_OBJC_CLASS_$_ClassNmae”, referenced from: objc-class-ref inD: symbol(s) not found for architecture x86_64Clang: error: linker command failed with exit code 1 (use -v to seeI had several targets in Xcode with several schemas ( Production , Dev etc ). You must go in and set each file’s target manually afterwords:In my Case , it was not a library, it was some classes. If that folder appears blue I think it indicates its not properly linked. 9:I have found this can also occur if you drag a folder with Objective-C files into your project. You just need to delete an entry from the “Framework Search Paths” setting, found in your TARGETS > Build Settings > Search Paths section (make sure the “All” tab is selected)If you see another entry here (besides $(inherited)) for your main target(s) or your test target, just delete the faulty path from all targets and rebuild. You’ll probably see a huge number of errors related to pretty much all of the frameworks you’re using.The fix is actually quite simple. One of the symptoms in my case was that the app runs on the device not in the simulator. Where is custom animation in powerpoint for macDo this and you should see the pbxproj file update and it should fix this error.This also assumes you’ve done what was suggested above and have properly linked all the right frameworks. So you will get auto-complete working and it will find the classes you imported, but when it goes to actually build the image it fails with this error code.The solution is to not add the folder but rather add the files. However you may find that after you added a folder that the pbxproj file did not change (and hence there is a linking error). Delete Derived Data (Window/Projects… select your target.
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